Recent data indicates atmospheric carbon dioxide (CO2) levels are rising. What change in the carbon cycle has most likely caused this increase in atmospheric CO2?
an increase in photosynthesis
a decrease in decomposition by soil bacteria
an increase in burning fossil fuels
a decrease in animal cellular respiration​

Respuesta :

Answer: The present atmospheric CO2 increase is caused by anthro- pogenic emissions of CO2. About three-quarters of these emissions are due to fossil fuel burning.

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Explanation: